🚀 Add Enhanced Error Reporting, Hook Example, and Code Refactors

Summary:

This PR introduces several improvements to developer experience, error clarity, and code maintainability in OxiMod.

✨ Features Added:

• Enhanced Error Output with Suggestions and Backtraces

  • Errors now print:
    • A colored and bolded "Backtrace" section
    • A colored and bolded "Suggestion" section (if applicable)
  • Helps identify the source of validation or runtime issues more quickly
  • Activated via:

    RUST_BACKTRACE=full cargo run --example your_example

• New hook_usage Example

  • Demonstrates how to define custom behavior in an impl block
  • Log model shows how a pre-save action can be combined with save().await?
  • Encourages adding domain-specific pre-processing logic using idiomatic Rust

🧪 Examples Updated:

• Added: examples/hook_usage.rs
  • Prints log messages before saving and demonstrates hook-style usage

📚 Docs:

• Updated README.md:
  • Added section about enabling backtraces using RUST_BACKTRACE
  • Listed hook_usage in the runnable examples
  • Clarified validation feedback and error formatting

🛠️ Refactored Code:

• Refactored validate, index, and default code
• Improved modularity and reuse of formatting helpers

Closes #10